Method of making can bodies



J. BRENZ'INGER 2,183,738,

METHOD OF MAKING CAN BODIES 2 Sheets-SheetI 1 Filed May 5, 193sINVENTV'OR .fu/zus enzzzggef ATTORN EY l I i *i Dec. 19, 1939. 1BRENzlNGER y 2,183,738

' METHOD oF MAKING CAN BODIES. A

Filed may 5, 193s 2 sheets-sheet 2 ATTO RN EY Patented Dec. 19, 1939UNITED STATES PATENT oFl-lca METHOD F MAKING CAN BODIESJulius'Bl-enzinger, Fairlleld, Conn.

Application May 5, 193.6, Serial No. 77,939 v zclaims. (c1. 11s-12o) Thepresent invention relates to a method of making can bodies, and has forits main object and feature the production of a can body with anunusually strong side seam capable of with- 6 standing a high internalpressure in the can withoutopening the seam.

In the accompanying drawings the invention is disclosed in severalconcrete and preferred forms in which Fig. 1 is a view in side elevationof a can body embodying the invention;

Fig. 2 is a detail sectional view substantially on the plane of line 2 2of Fig. 4;

, Fig. 3 is a detail sectional view substantially l5 on the plane ofline 3 3 of Fig. 1;

Fig. 4 is a detail sectional view substantially on the plane of line 4 4of Fig. 1;

Fig. 5 is a detail sectional view similar to Fig. 3, but showing amodicatLn of the invention;

30 Fig. 6 is a view similar to Fig. 3 with the solder applied to theseam and the interstices thereof;

Fig.7 is a view similar to Fig. 5 also with the solder applied to theseam and the-iterstices thereof;

Fig. 8 is a transverse sectional view of a collapsible horn, with thebody in position, and a hammer to clinch the seam and a cutting deviceto sever said seam at one or more points;

Fig. 9 is a fragmentary detail view in side elevation of the hammershown in Fig. 8;

Fig. 10 is a view similar to Fig. 8 but showing a modied cutting deviceto produce the seam of Fig. 5, the section being substantially on theplane of line Ill-I0 of Fig. 11,; and

Fig. 11 is a view partly in side elevation and partly in section of theparts shown in Fig. 10.

Body I is made up of a blank of sheet material having, at its oppositeedges, opposed hooks 2 and 3. The body is formed around l `rn 4 whilethe latter is collapsed and the hooks are caused to interengage, afterwhich the horn is expanded by taper member 5 acting on pivoted wings .6and the hooks interlock undertension. 1 indicates a hammer having areciprocatory movement toward and away from the horn to clinch thehooks. while under tension, inte a seam as 8. Carried by the hammer isone or more cutting tools i and on the horn there is one or morecomplementary cutting elements I0. The result is that during the actionof clinching the seam, complementary cutters 9 and I0 partially severand displace the sheet material of the seam at one or more points in itslength. The effect can readily be understood by considering Figs. 1-4,in which Fig. 2 shows the ordinary seam l that is clinched or attened bythe hammer, but at a number of points Il (Fig. l) the material of theseam is partially severed. One of these points is shown in section inFigs. 3 and 4 from which it appears that the ma terial is not merelyindented but' actually severed and displaced inwardly. Owing to the factthat there are four layers of metal an unusually strong joint is formed.The joint I2 of the seam, as well as the interstices as I3 of thepartially severed material is now preferably covered or lled with a 1I)Ybody of solder I4 (Fig. 6) and it has been found that the solderinsinuates itself into the various crevices or interstices to such anextent that a very complete seal is formed.

In the construction thus far described the 15 severance of the seamtakes place on two parallel lines I5 extending lengthwise of the seam,but in Figs. 5, 7, l0 and 1l a modified construction is shown. As theredisclosed, the complementary cutting members 9a and Illa are so shapedthat 20 the cutting action takes place only along one line I5a and themetal of the seam is distorted as shown in Fig. 5. Thereafter a body ofsolder Ila is used to cover the joint and interstices of the seam aswill be understood. g5

In the form of the invention'shown in Fig. 8 cutting member 9 and thehammer are rigidly mounted with respect to each other, the cuttingmember projecting a slight distance above the face of the hammer. In themodication shown n in Figs. l0 and 11, hammer la is mounted on a springI6 and normally is flush with the cutting tool, which latter is mountedrigidly. When the hammer strikes the hooks of the blank to form theseam, it recedes somewhat owing to the spring 35 and allows the cuttingtool to act.

The article of manufacture, the can body, is not claimed herein butforms the subject matter of another application Ser. No. 204,808, illedApril 28, 1938. Y o

The apparatus for carrying on the method of this application is notclaimed herein but forms the-subject matter of another application Ser.No. 261,690, iled March 14, 1939.

1. The methodof forming the longitudinal seam of a sheet-material bodywhich consists in: providing the opposite edges of a blank with opposedhooks; forming the blank into a body with the hooks interengaged;interlocking the hooks 50 under tension; and clinching the hooks, whileunder tension, into a seam and during the action of clinching partiallysevering the material of the seam at one or more points at spacedintervals and displacing the layers thereof inwardly.

2. The method or forming the longitdinal seam ing the action oiclinching partially severing the of a sheet-material body which consistsin: promaterial of the seam at one or more points at viding the oppositeedges of a blank'with two spaced intervals and displacing the 'layersthereof continuous and opposed hooks; forming the blank inwardly; andapplying solder to the seam and 5 into a body with'the hooksinterensaged; interthe interstices of the partially' severed material Ilocking the hooks under tension; clinching -the thereof.. hooks, whileunder tension, into a seam and durl JULIUS BRENZINGER.

c makin.

cERTIFrcATE oF CORRECTION.

Patent No. 2,185,758. December 19, 1959.

.TULIUS BRENZINGER.

It is hereby certified that error appears in the printed specificationofthe above numbered patent requiring correction as follows; Page l,second column, line )48, claim 1, after'the word "with" insert twocontinuous and; and that the said Letters Patent shouldbe read with thiscorrection therein that the same may conform to the record of the case"in the Patent Office. 9

Signed and sealed this 6th day of February, A. D. 19h.O.

v Henry Van Arsdele, (Seal) Acting Commissioner of Patents.

